Spray gun



Dec. 3, 1929. E. s. sAcHsENMAu-:R

SPRAY GUN Filed Dec. 10. 1927 Etty/a, E

GMM/mf Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE ERVIN SAMUELSACHSENMAIER, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO DUNNINGCOMPRESSOR CO., OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA SPRAY GUN Application l'ed December 10, 1927. Serial No,239,232.

This present invention relates to a device for spraying paint or otherliquid materlals Y by means of compressed air.

The principal object of the invention is the provision of a liquidsupply tank and acompressed air nozzle, and conduit assemblies soarranged that the most etlicient results may be secured, which will bepositive in its operation and which will have no parts to get out oforder.

To this end the invention consists in a device of the above typeincluding an elongated chamber to which compressed air or other Huid issupplied, which chamber serves as the operating handle. At the head ofthis chamber is located a spring actuated exhaust valve adapted to beclosed manually. Also in the head of the chamber is arranged a nozzlethrough which the compressed iiuid passes when the exhaust valve isclosed. The exhaust valve aperture being considerably larger than theaperture in the compressed fluid nozzle, the luidwill exhaust throughthe former rather than through the latter when the exhaust valve isunseated.

The liquid supply reservoir consists of a jar or the like provided witha screw cover apertured to receive the liquid or aspirator tube whichextends from near the bottom of the jar through the cover and outthrough the top to a point in proximity to the restricted end of thecompressed air nozzle. A plate carrying the elongated compressed airchamber and the nozzle is detachably secured to the liquid reservoirtop.

The upper portion of the liquid supply tube is threaded and providedwith a longitudinal slot or keyway in which rides a key portion of theplate carrying the compressed air chamber. This eectively prevents theliquid tube from turning.

Beneath the liquid supply reservoir cover and surrounding the liquidsupply tube is a coil spring held under compression by a nut threaded tothe supply tube. A similarly threaded nut is threaded to the upperportion of the liquid supply tube which projects above the plate and byadjusting this nut the restricted bore of the liquid tube may be broughtinto or out of proximity to the Compressed fluid nozzle in order toproduce the' arrangement, combination and constructiony of partsmorefully described hereinafter and shown in the accompanying drawings,in which:-

Figure l is a front sectional elevation of a device embodying myinvention.

lgig. 2 is a sectional detail of the supply tu e.

Fig. 3 is a sectional plan along the line 3-3 ofFig. 2.

Referring now to the embodiment illustrated, I have shown the elongatedcompressed air chamber at 1 whichy serves as a handle for the device'provided at its lower end with a tube2 to which the compressed air tooperate the device is supplied. The upper end of the chamber 1 isprovided with an interior wall 3 having an aperture adapted to be closedbythe exhaust valve 4. A port 5 communicating to the outside atmosphere.

permits compressed air within the chamber 1 to escape when the exhaustvalve 4 is removed from its seat. The exhaust valve is provided with abutton head 6 and includes acoil spring 7 which normally tends to keepthe head 4 oif its seat. When operating the device, the operator withhis thumb depresses the button head 6, thus closing the aperture in theinner wall 3.

A screw threaded closure 8 is provided in the top of the chamber 1 whichcarries the shank of the exhaust valve.

Also secured in the head of the chamber 1 is the compressed iluid nozzle9 of a diameter smaller than the diameter of the exhaust aperture. Thisnozzle 9 is provided with a restricted tip 10 as is customary in suchconstructions.

The reservoir adapted to contain the material 4to be sprayed may consistof a jar `11 having a screw cap 12, the cap 12 being apertured toreceive the liquid supply tube 13. This last named member extends fromnear the bottom of the jar 11 out through the top of the cap 12 andterminates in a restricted end portion 14 in proximity to the nozzlepoint- 10.

The tube 13 is provided with a longitudinal groove 15 in which rides thekey 16 upon the plate 17 so that the supply tube is prevented fromturning by these instrumentalities.

The plate 17 is secured to the top 12 of the jar 11 by solder, rivets orother suitable means. On top of the plate 17 is located the adjustingnutv20 which is held against the plate 17 by the tension ofthe spring18. The face of the adjusting nut 2O is concentric with the liquid tube13 and the tension of the spring 18 holds the face of the nut 20 againstthe face of the plate 17 This keeps the liquid tube 13 alwaysperpendicular to the face of the plate 17. At the same time by movingthe adjusting nut 20 the tip 14 of the supply tube may be moved up ordown as desired to produce the required character of spray.

The plate 17 is provided with an upwardly bent extension 21 to receivethe end of the compressed air supply nozzle 9 and a further extension 22to which the elongated compressed air supply chamber 1 is secured bymeans of the lange 2 3 and the nut 24. j

It is to be noted that by means of the instrumentalities preventing theliquid supply tube from turning and the adjusting nut 2O quick andaccurate adjustment and alignment may be had and maintained between the`tube tip and the compressed air nozzle. This adjustment and alignmentis necessary to produce an eicient device.

In operation the ar 11 is filled with the desired liquid to be sprayedand compressed fluid supplied to the tube 2. Compressed fluid nowexhausts through the port 5 and no liquid is sprayed. Upon the operatormanually closing the exhaust valve 4 by depressing the button 6compressed air must pass through the nozzle 9 and over the tip 14 of theliquid tube 13 which aspirates liquid from the jar 11 and breaks themass character of spray depending upon the relation of the tips 14 and10.

It is to be noted that by removing the adjusting nut 20, the liquid tube13 may be readily and quickly detached from the device for repair orreplacement. When it is desired to refill the jar 11 the cap may beremoved which carrying the rest of the mechanism allowsthe operator toreplenish his liquid supply nozzle extending from said chamber,

' compressed air chamber into the desired adjusting nut threaded vto theliquid supply tube and engaging the plate.

2. A spray gun comprising a compressed iluid chamber, a manuallyoperated exhaust by-pass carried thereby, a compressed fluid a liquidsupply tank, a liquid aspirator tube carried thereby, the tips of thecompressed air nozzle and the liquid supply tube being in proximity toeach other, a cap on the liquid supply tank, a spring encircling theliquid supply tube and below the cap a nut on the tube below the spring,a plate carrying the compressed luid chamber on top of the ca and anadjusting nut threaded to the liqui supply tube and engaging the plate,a key on said plate riding in a longitudinal keyway on the liquid supplytube whereby said tube is prevented from turning movement.

3. A spraying device comprising a liquid container having a removabletop, a plate secured to the top and having an integral upwardly turnedlug provided with an aperture,l said top and plate having coincidingapertures, an aspirating tube vertically adjustable in said apertures,said plate having an extension to one side of the container cover, aremovably carried by said extension and forming a handle and having aportion extended above said extension, a blast pipe connected to saidportion and having its forward portion passing through said apertureand-terminating adjacent the` upper end of the aspirating tube, saidupper portion of the compressed air chamber having an exhaust port andvalve means for controlling said port.

4. A spraying device according to claim 3 in which the extension of theplate on the container top is provided with a slot to receive thecompressed air chamber, and said chamber is provided with a shoulderengaging one face of the plate and a clamping nut engaging the otherface.

In testimony whereof, I atlix my signature.

ERVIN SAMUEL SACHSENMAIER.

without cumbersome parts being in his way.

What I claim is: j

1. A spray gun comprising a compressed fluid chamber, a manuallyoperated exhaust by-pass carried thereby, a compressed fluid nozzleextending from said chamber, a liquid supply tank, a liquid aspiratortube carried thereby, the tips of the comressed air nozzle and theliquid supply tube ity to each other, a ca tank, a spring encirc tubeand below the cap, low the spring, a plate carr pressed fluid chamber ontop o on the liquid supply ing the liquid supply a nut on the tube beingthe comthe cap and an eing in proxim-

